It used to be the case that everyone viewed webpages on about the same size screen. But with the explosion of the use of smartphones to access the Internet, the landscape of design has completely changed. People viewing your site will now expect that it will perform regardless of the platform (smartphone, tablet, laptop, or desktop computer). This ability to respond to any platform is called responsive design.
This course will expand upon the basic knowledge of CSS3 to include topics such as wireframes, fluid design, media queries, and the use of existing styling paradigms such as Bootstrap. After the course, learners will be able to:
** Explain the mobile-first paradigm and the importance of wireframes in the design phase
** Create sites that behave across a range of platforms
** Utilize existing design frameworks such as Bootstrap
This is the fourth course in the Web Design For Everybody specialization. A basic understanding of HTML and CSS is expected when you enroll in this class. Additional courses focus on adding interactivity with the JavaScript Programming Language and completing a capstone project.

From the lesson

Week Two: Basic Concepts

This week you will get a chance to put the theories into practice using media queries in your CSS. These queries can automatically detect the size of the browser being used to view the page so that you can decide what type of look you want to achieve. There will also be a discussion on common practices for designing your different views at various screen sizes ("viewports").